From 2b3f350071c50f7d3850b72669ed536569a372a1 Mon Sep 17 00:00:00 2001
From: Massimiliano Culpo <massimiliano.culpo@gmail.com>
Date: Tue, 7 Jun 2022 18:07:13 +0200
Subject: Use __slots__ for fast attribute access

---
 lib/spack/llnl/util/lang.py |  2 ++
 lib/spack/spack/spec.py     | 10 ++++++++++
 2 files changed, 12 insertions(+)

diff --git a/lib/spack/llnl/util/lang.py b/lib/spack/llnl/util/lang.py
index 314566e97a..8ec7113782 100644
--- a/lib/spack/llnl/util/lang.py
+++ b/lib/spack/llnl/util/lang.py
@@ -486,6 +486,8 @@ class HashableMap(MutableMapping):
     """This is a hashable, comparable dictionary.  Hash is performed on
     a tuple of the values in the dictionary."""
 
+    __slots__ = 'dict',
+
     def __init__(self):
         self.dict = {}
 
diff --git a/lib/spack/spack/spec.py b/lib/spack/spack/spec.py
index a325670289..fc8a884511 100644
--- a/lib/spack/spack/spec.py
+++ b/lib/spack/spack/spec.py
@@ -243,6 +243,8 @@ class ArchSpec(object):
         """Return the frontend architecture"""
         return ArchSpec._return_arch("frontend", "frontend")
 
+    __slots__ = '_platform', '_os', '_target'
+
     def __init__(self, spec_or_platform_tuple=(None, None, None)):
         """Architecture specification a package should be built with.
 
@@ -553,6 +555,8 @@ class CompilerSpec(object):
     versions that a package should be built with.  CompilerSpecs have a
     name and a version list."""
 
+    __slots__ = 'name', 'versions'
+
     def __init__(self, *args):
         nargs = len(args)
         if nargs == 1:
@@ -677,6 +681,8 @@ class DependencySpec(object):
     - deptypes: list of strings, representing dependency relationships.
     """
 
+    __slots__ = 'parent', 'spec', 'deptypes'
+
     def __init__(self, parent, spec, deptypes):
         self.parent = parent
         self.spec = spec
@@ -717,6 +723,9 @@ _valid_compiler_flags = ["cflags", "cxxflags", "fflags", "ldflags", "ldlibs", "c
 
 
 class FlagMap(lang.HashableMap):
+
+    __slots__ = 'spec',
+
     def __init__(self, spec):
         super(FlagMap, self).__init__()
         self.spec = spec
@@ -801,6 +810,7 @@ class _EdgeMap(Mapping):
 
     Edges are stored in a dictionary and keyed by package name.
     """
+    __slots__ = 'edges', 'store_by_child'
 
     def __init__(self, store_by=EdgeDirection.child):
         # Sanitize input arguments
-- 
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